1/*
2 * Copyright (c) 2009-2014, 2016-2018 ARM Limited
3 * All rights reserved.
4 *
5 * The license below extends only to copyright in the software and shall
6 * not be construed as granting a license to any other intellectual
7 * property including but not limited to intellectual property relating
8 * to a hardware implementation of the functionality of the software
9 * licensed hereunder. You may use the software subject to the license
10 * terms below provided that you ensure that this notice is replicated
11 * unmodified and in its entirety in all distributions of the software,
12 * modified or unmodified, in source code or in binary form.
13 *
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions are
16 * met: redistributions of source code must retain the above copyright
17 * notice, this list of conditions and the following disclaimer;
18 * redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions and the following disclaimer in the
20 * documentation and/or other materials provided with the distribution;
21 * neither the name of the copyright holders nor the names of its
22 * contributors may be used to endorse or promote products derived from
23 * this software without specific prior written permission.
24 *
25 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
26 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
27 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
28 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
29 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
30 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
31 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
32 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
33 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
34 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
35 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
36 *
37 * Authors: Ali Saidi
38 */
39
40#include "arch/arm/utility.hh"
41
42#include <memory>
43
44#include "arch/arm/faults.hh"
45#include "arch/arm/isa_traits.hh"
46#include "arch/arm/system.hh"
47#include "arch/arm/tlb.hh"
48#include "arch/arm/vtophys.hh"
49#include "cpu/base.hh"
50#include "cpu/checker/cpu.hh"
51#include "cpu/thread_context.hh"
52#include "mem/fs_translating_port_proxy.hh"
53#include "sim/full_system.hh"
54
55namespace ArmISA {
56
57void
58initCPU(ThreadContext *tc, int cpuId)
59{
60 // Reset CP15?? What does that mean -- ali
61
62 // FPEXC.EN = 0
63
64 static Fault reset = std::make_shared<Reset>();
65 reset->invoke(tc);
66}
67
68uint64_t
69getArgument(ThreadContext *tc, int &number, uint16_t size, bool fp)
70{
71 if (!FullSystem) {
72 panic("getArgument() only implemented for full system mode.\n");
73 M5_DUMMY_RETURN
74 }
75
76 if (fp)
77 panic("getArgument(): Floating point arguments not implemented\n");
78
79 if (inAArch64(tc)) {
80 if (size == (uint16_t)(-1))
81 size = sizeof(uint64_t);
82
83 if (number < 8 /*NumArgumentRegs64*/) {
84 return tc->readIntReg(number);
85 } else {
86 panic("getArgument(): No support reading stack args for AArch64\n");
87 }
88 } else {
89 if (size == (uint16_t)(-1))
90 // todo: should this not be sizeof(uint32_t) rather?
91 size = ArmISA::MachineBytes;
92
93 if (number < NumArgumentRegs) {
94 // If the argument is 64 bits, it must be in an even regiser
95 // number. Increment the number here if it isn't even.
96 if (size == sizeof(uint64_t)) {
97 if ((number % 2) != 0)
98 number++;
99 // Read the two halves of the data. Number is inc here to
100 // get the second half of the 64 bit reg.
101 uint64_t tmp;
102 tmp = tc->readIntReg(number++);
103 tmp |= tc->readIntReg(number) << 32;
104 return tmp;
105 } else {
106 return tc->readIntReg(number);
107 }
108 } else {
109 Addr sp = tc->readIntReg(StackPointerReg);
110 FSTranslatingPortProxy &vp = tc->getVirtProxy();
111 uint64_t arg;
112 if (size == sizeof(uint64_t)) {
113 // If the argument is even it must be aligned
114 if ((number % 2) != 0)
115 number++;
116 arg = vp.read<uint64_t>(sp +
117 (number-NumArgumentRegs) * sizeof(uint32_t));
118 // since two 32 bit args == 1 64 bit arg, increment number
119 number++;
120 } else {
121 arg = vp.read<uint32_t>(sp +
122 (number-NumArgumentRegs) * sizeof(uint32_t));
123 }
124 return arg;
125 }
126 }
127 panic("getArgument() should always return\n");
128}
129
130void
131skipFunction(ThreadContext *tc)
132{
133 PCState newPC = tc->pcState();
134 if (inAArch64(tc)) {
135 newPC.set(tc->readIntReg(INTREG_X30));
136 } else {
137 newPC.set(tc->readIntReg(ReturnAddressReg) & ~ULL(1));
138 }
139
140 CheckerCPU *checker = tc->getCheckerCpuPtr();
141 if (checker) {
142 tc->pcStateNoRecord(newPC);
143 } else {
144 tc->pcState(newPC);
145 }
146}
147
148static void
149copyVecRegs(ThreadContext *src, ThreadContext *dest)
150{
151 auto src_mode = RenameMode<ArmISA::ISA>::mode(src->pcState());
152
153 // The way vector registers are copied (VecReg vs VecElem) is relevant
154 // in the O3 model only.
155 if (src_mode == Enums::Full) {
156 for (auto idx = 0; idx < NumVecRegs; idx++)
157 dest->setVecRegFlat(idx, src->readVecRegFlat(idx));
158 } else {
159 for (auto idx = 0; idx < NumVecRegs; idx++)
160 for (auto elem_idx = 0; elem_idx < NumVecElemPerVecReg; elem_idx++)
161 dest->setVecElemFlat(
162 idx, elem_idx, src->readVecElemFlat(idx, elem_idx));
163 }
164}
165
166void
167copyRegs(ThreadContext *src, ThreadContext *dest)
168{
169 for (int i = 0; i < NumIntRegs; i++)
170 dest->setIntRegFlat(i, src->readIntRegFlat(i));
171
172 for (int i = 0; i < NumFloatRegs; i++)
173 dest->setFloatRegFlat(i, src->readFloatRegFlat(i));
174
175 for (int i = 0; i < NumCCRegs; i++)
176 dest->setCCReg(i, src->readCCReg(i));
177
178 for (int i = 0; i < NumMiscRegs; i++)
179 dest->setMiscRegNoEffect(i, src->readMiscRegNoEffect(i));
180
181 copyVecRegs(src, dest);
182
183 // setMiscReg "with effect" will set the misc register mapping correctly.
184 // e.g. updateRegMap(val)
185 dest->setMiscReg(MISCREG_CPSR, src->readMiscRegNoEffect(MISCREG_CPSR));
186
187 // Copy over the PC State
188 dest->pcState(src->pcState());
189
190 // Invalidate the tlb misc register cache
191 dynamic_cast<TLB *>(dest->getITBPtr())->invalidateMiscReg();
192 dynamic_cast<TLB *>(dest->getDTBPtr())->invalidateMiscReg();
193}
194
195bool
196inSecureState(ThreadContext *tc)
197{
198 SCR scr = inAArch64(tc) ? tc->readMiscReg(MISCREG_SCR_EL3) :
199 tc->readMiscReg(MISCREG_SCR);
200 return ArmSystem::haveSecurity(tc) && inSecureState(
201 scr, tc->readMiscReg(MISCREG_CPSR));
202}
203
204inline bool
205isSecureBelowEL3(ThreadContext *tc)
206{
207 SCR scr = tc->readMiscReg(MISCREG_SCR_EL3);
208 return ArmSystem::haveEL(tc, EL3) && scr.ns == 0;
209}
210
211bool
212inAArch64(ThreadContext *tc)
213{
214 CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
215 return opModeIs64((OperatingMode) (uint8_t) cpsr.mode);
216}
217
218bool
219longDescFormatInUse(ThreadContext *tc)
220{
221 TTBCR ttbcr = tc->readMiscReg(MISCREG_TTBCR);
222 return ArmSystem::haveLPAE(tc) && ttbcr.eae;
223}
224
225RegVal
226readMPIDR(ArmSystem *arm_sys, ThreadContext *tc)
227{
228 CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
229 const ExceptionLevel current_el =
230 opModeToEL((OperatingMode) (uint8_t) cpsr.mode);
231
232 const bool is_secure = isSecureBelowEL3(tc);
233
234 switch (current_el) {
235 case EL0:
236 // Note: in MsrMrs instruction we read the register value before
237 // checking access permissions. This means that EL0 entry must
238 // be part of the table even if MPIDR is not accessible in user
239 // mode.
240 warn_once("Trying to read MPIDR at EL0\n");
241 M5_FALLTHROUGH;
242 case EL1:
243 if (ArmSystem::haveEL(tc, EL2) && !is_secure)
244 return tc->readMiscReg(MISCREG_VMPIDR_EL2);
245 else
246 return getMPIDR(arm_sys, tc);
247 case EL2:
248 case EL3:
249 return getMPIDR(arm_sys, tc);
250 default:
251 panic("Invalid EL for reading MPIDR register\n");
252 }
253}
254
255RegVal
256getMPIDR(ArmSystem *arm_sys, ThreadContext *tc)
257{
258 // Multiprocessor Affinity Register MPIDR from Cortex(tm)-A15 Technical
259 // Reference Manual
260 //
261 // bit 31 - Multi-processor extensions available
262 // bit 30 - Uni-processor system
263 // bit 24 - Multi-threaded cores
264 // bit 11-8 - Cluster ID
265 // bit 1-0 - CPU ID
266 //
267 // We deliberately extend both the Cluster ID and CPU ID fields to allow
268 // for simulation of larger systems
269 assert((0 <= tc->cpuId()) && (tc->cpuId() < 256));
270 assert(tc->socketId() < 65536);
271 if (arm_sys->multiThread) {
272 return 0x80000000 | // multiprocessor extensions available
273 0x01000000 | // multi-threaded cores
274 tc->contextId();
275 } else if (arm_sys->multiProc) {
276 return 0x80000000 | // multiprocessor extensions available
277 tc->cpuId() | tc->socketId() << 8;
278 } else {
279 return 0x80000000 | // multiprocessor extensions available
280 0x40000000 | // in up system
281 tc->cpuId() | tc->socketId() << 8;
282 }
283}
284
285bool
286ELIs64(ThreadContext *tc, ExceptionLevel el)
287{
288 return !ELIs32(tc, el);
289}
290
291bool
292ELIs32(ThreadContext *tc, ExceptionLevel el)
293{
294 bool known, aarch32;
295 std::tie(known, aarch32) = ELUsingAArch32K(tc, el);
296 panic_if(!known, "EL state is UNKNOWN");
297 return aarch32;
298}
299
300bool
301ELIsInHost(ThreadContext *tc, ExceptionLevel el)
302{
303 if (!ArmSystem::haveVirtualization(tc)) {
304 return false;
305 }
306 HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2);
307 return (!isSecureBelowEL3(tc) && !ELIs32(tc, EL2) && hcr.e2h == 1 &&
308 (el == EL2 || (el == EL0 && hcr.tge == 1)));
309}
310
311std::pair<bool, bool>
312ELUsingAArch32K(ThreadContext *tc, ExceptionLevel el)
313{
314 // Return true if the specified EL is in aarch32 state.
315 const bool have_el3 = ArmSystem::haveSecurity(tc);
316 const bool have_el2 = ArmSystem::haveVirtualization(tc);
317
318 panic_if(el == EL2 && !have_el2, "Asking for EL2 when it doesn't exist");
319 panic_if(el == EL3 && !have_el3, "Asking for EL3 when it doesn't exist");
320
321 bool known, aarch32;
322 known = aarch32 = false;
323 if (ArmSystem::highestELIs64(tc) && ArmSystem::highestEL(tc) == el) {
324 // Target EL is the highest one in a system where
325 // the highest is using AArch64.
326 known = true; aarch32 = false;
327 } else if (!ArmSystem::highestELIs64(tc)) {
328 // All ELs are using AArch32:
329 known = true; aarch32 = true;
330 } else {
331 SCR scr = tc->readMiscReg(MISCREG_SCR_EL3);
332 bool aarch32_below_el3 = (have_el3 && scr.rw == 0);
333
334 HCR hcr = tc->readMiscReg(MISCREG_HCR_EL2);
335 bool aarch32_at_el1 = (aarch32_below_el3
336 || (have_el2
337 && !isSecureBelowEL3(tc) && hcr.rw == 0));
338
339 // Only know if EL0 using AArch32 from PSTATE
340 if (el == EL0 && !aarch32_at_el1) {
341 // EL0 controlled by PSTATE
342 CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
343
344 known = (cpsr.el == EL0);
345 aarch32 = (cpsr.width == 1);
346 } else {
347 known = true;
348 aarch32 = (aarch32_below_el3 && el != EL3)
349 || (aarch32_at_el1 && (el == EL0 || el == EL1) );
350 }
351 }
352
353 return std::make_pair(known, aarch32);
354}
355
356bool
357isBigEndian64(ThreadContext *tc)
358{
359 switch (opModeToEL(currOpMode(tc))) {
360 case EL3:
361 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL3)).ee;
362 case EL2:
363 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL2)).ee;
364 case EL1:
365 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL1)).ee;
366 case EL0:
367 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL1)).e0e;
368 default:
369 panic("Invalid exception level");
370 break;
371 }
372}
373
374bool
375badMode32(ThreadContext *tc, OperatingMode mode)
376{
377 return unknownMode32(mode) || !ArmSystem::haveEL(tc, opModeToEL(mode));
378}
379
380bool
381badMode(ThreadContext *tc, OperatingMode mode)
382{
383 return unknownMode(mode) || !ArmSystem::haveEL(tc, opModeToEL(mode));
384}
385
386Addr
387purifyTaggedAddr(Addr addr, ThreadContext *tc, ExceptionLevel el,
388 TTBCR tcr)
389{
390 switch (el) {
391 case EL0:
392 case EL1:
393 if (bits(addr, 55, 48) == 0xFF && tcr.tbi1)
394 return addr | mask(63, 55);
395 else if (!bits(addr, 55, 48) && tcr.tbi0)
396 return bits(addr,55, 0);
397 break;
398 case EL2:
399 assert(ArmSystem::haveVirtualization(tc));
400 tcr = tc->readMiscReg(MISCREG_TCR_EL2);
401 if (tcr.tbi)
402 return addr & mask(56);
403 break;
404 case EL3:
405 assert(ArmSystem::haveSecurity(tc));
406 if (tcr.tbi)
407 return addr & mask(56);
408 break;
409 default:
410 panic("Invalid exception level");
411 break;
412 }
413
414 return addr; // Nothing to do if this is not a tagged address
415}
416
417Addr
418purifyTaggedAddr(Addr addr, ThreadContext *tc, ExceptionLevel el)
419{
420 TTBCR tcr;
421
422 switch (el) {
423 case EL0:
424 case EL1:
425 tcr = tc->readMiscReg(MISCREG_TCR_EL1);
426 if (bits(addr, 55, 48) == 0xFF && tcr.tbi1)
427 return addr | mask(63, 55);
428 else if (!bits(addr, 55, 48) && tcr.tbi0)
429 return bits(addr,55, 0);
430 break;
431 case EL2:
432 assert(ArmSystem::haveVirtualization(tc));
433 tcr = tc->readMiscReg(MISCREG_TCR_EL2);
434 if (tcr.tbi)
435 return addr & mask(56);
436 break;
437 case EL3:
438 assert(ArmSystem::haveSecurity(tc));
439 tcr = tc->readMiscReg(MISCREG_TCR_EL3);
440 if (tcr.tbi)
441 return addr & mask(56);
442 break;
443 default:
444 panic("Invalid exception level");
445 break;
446 }
447
448 return addr; // Nothing to do if this is not a tagged address
449}
450
451Addr
452truncPage(Addr addr)
453{
454 return addr & ~(PageBytes - 1);
455}
456
457Addr
458roundPage(Addr addr)
459{
460 return (addr + PageBytes - 1) & ~(PageBytes - 1);
461}
462
463bool
464mcrMrc15TrapToHyp(const MiscRegIndex miscReg, ThreadContext *tc, uint32_t iss)
465{
466 bool isRead;
467 uint32_t crm;
468 IntRegIndex rt;
469 uint32_t crn;
470 uint32_t opc1;
471 uint32_t opc2;
472 bool trapToHype = false;
473
474 const CPSR cpsr = tc->readMiscReg(MISCREG_CPSR);
475 const HCR hcr = tc->readMiscReg(MISCREG_HCR);
476 const SCR scr = tc->readMiscReg(MISCREG_SCR);
477 const HDCR hdcr = tc->readMiscReg(MISCREG_HDCR);
478 const HSTR hstr = tc->readMiscReg(MISCREG_HSTR);
479 const HCPTR hcptr = tc->readMiscReg(MISCREG_HCPTR);
480
481 if (!inSecureState(scr, cpsr) && (cpsr.mode != MODE_HYP)) {
482 mcrMrcIssExtract(iss, isRead, crm, rt, crn, opc1, opc2);
483 trapToHype = ((uint32_t) hstr) & (1 << crn);
484 trapToHype |= hdcr.tpm && (crn == 9) && (crm >= 12);
485 trapToHype |= hcr.tidcp && (
486 ((crn == 9) && ((crm <= 2) || ((crm >= 5) && (crm <= 8)))) ||
487 ((crn == 10) && ((crm <= 1) || (crm == 4) || (crm == 8))) ||
488 ((crn == 11) && ((crm <= 8) || (crm == 15))) );
489
490 if (!trapToHype) {
491 switch (unflattenMiscReg(miscReg)) {
492 case MISCREG_CPACR:
493 trapToHype = hcptr.tcpac;
494 break;
495 case MISCREG_REVIDR:
496 case MISCREG_TCMTR:
497 case MISCREG_TLBTR:
498 case MISCREG_AIDR:
499 trapToHype = hcr.tid1;
500 break;
501 case MISCREG_CTR:
502 case MISCREG_CCSIDR:
503 case MISCREG_CLIDR:
504 case MISCREG_CSSELR:
505 trapToHype = hcr.tid2;
506 break;
507 case MISCREG_ID_PFR0:
508 case MISCREG_ID_PFR1:
509 case MISCREG_ID_DFR0:
510 case MISCREG_ID_AFR0:
511 case MISCREG_ID_MMFR0:
512 case MISCREG_ID_MMFR1:
513 case MISCREG_ID_MMFR2:
514 case MISCREG_ID_MMFR3:
515 case MISCREG_ID_ISAR0:
516 case MISCREG_ID_ISAR1:
517 case MISCREG_ID_ISAR2:
518 case MISCREG_ID_ISAR3:
519 case MISCREG_ID_ISAR4:
520 case MISCREG_ID_ISAR5:
521 trapToHype = hcr.tid3;
522 break;
523 case MISCREG_DCISW:
524 case MISCREG_DCCSW:
525 case MISCREG_DCCISW:
526 trapToHype = hcr.tsw;
527 break;
528 case MISCREG_DCIMVAC:
529 case MISCREG_DCCIMVAC:
530 case MISCREG_DCCMVAC:
531 trapToHype = hcr.tpc;
532 break;
533 case MISCREG_ICIMVAU:
534 case MISCREG_ICIALLU:
535 case MISCREG_ICIALLUIS:
536 case MISCREG_DCCMVAU:
537 trapToHype = hcr.tpu;
538 break;
539 case MISCREG_TLBIALLIS:
540 case MISCREG_TLBIMVAIS:
541 case MISCREG_TLBIASIDIS:
542 case MISCREG_TLBIMVAAIS:
543 case MISCREG_TLBIMVALIS:
544 case MISCREG_TLBIMVAALIS:
545 case MISCREG_DTLBIALL:
546 case MISCREG_ITLBIALL:
547 case MISCREG_DTLBIMVA:
548 case MISCREG_ITLBIMVA:
549 case MISCREG_DTLBIASID:
550 case MISCREG_ITLBIASID:
551 case MISCREG_TLBIMVAA:
552 case MISCREG_TLBIALL:
553 case MISCREG_TLBIMVA:
554 case MISCREG_TLBIMVAL:
555 case MISCREG_TLBIMVAAL:
556 case MISCREG_TLBIASID:
557 trapToHype = hcr.ttlb;
558 break;
559 case MISCREG_ACTLR:
560 trapToHype = hcr.tac;
561 break;
562 case MISCREG_SCTLR:
563 case MISCREG_TTBR0:
564 case MISCREG_TTBR1:
565 case MISCREG_TTBCR:
566 case MISCREG_DACR:
567 case MISCREG_DFSR:
568 case MISCREG_IFSR:
569 case MISCREG_DFAR:
570 case MISCREG_IFAR:
571 case MISCREG_ADFSR:
572 case MISCREG_AIFSR:
573 case MISCREG_PRRR:
574 case MISCREG_NMRR:
575 case MISCREG_MAIR0:
576 case MISCREG_MAIR1:
577 case MISCREG_CONTEXTIDR:
578 trapToHype = hcr.tvm & !isRead;
579 break;
580 case MISCREG_PMCR:
581 trapToHype = hdcr.tpmcr;
582 break;
583 // No default action needed
584 default:
585 break;
586 }
587 }
588 }
589 return trapToHype;
590}
591
592
593bool
594mcrMrc14TrapToHyp(const MiscRegIndex miscReg, HCR hcr, CPSR cpsr, SCR scr,
595 HDCR hdcr, HSTR hstr, HCPTR hcptr, uint32_t iss)
596{
597 bool isRead;
598 uint32_t crm;
599 IntRegIndex rt;
600 uint32_t crn;
601 uint32_t opc1;
602 uint32_t opc2;
603 bool trapToHype = false;
604
605 if (!inSecureState(scr, cpsr) && (cpsr.mode != MODE_HYP)) {
606 mcrMrcIssExtract(iss, isRead, crm, rt, crn, opc1, opc2);
607 inform("trap check M:%x N:%x 1:%x 2:%x hdcr %x, hcptr %x, hstr %x\n",
608 crm, crn, opc1, opc2, hdcr, hcptr, hstr);
609 trapToHype = hdcr.tda && (opc1 == 0);
610 trapToHype |= hcptr.tta && (opc1 == 1);
611 if (!trapToHype) {
612 switch (unflattenMiscReg(miscReg)) {
613 case MISCREG_DBGOSLSR:
614 case MISCREG_DBGOSLAR:
615 case MISCREG_DBGOSDLR:
616 case MISCREG_DBGPRCR:
617 trapToHype = hdcr.tdosa;
618 break;
619 case MISCREG_DBGDRAR:
620 case MISCREG_DBGDSAR:
621 trapToHype = hdcr.tdra;
622 break;
623 case MISCREG_JIDR:
624 trapToHype = hcr.tid0;
625 break;
626 case MISCREG_JOSCR:
627 case MISCREG_JMCR:
628 trapToHype = hstr.tjdbx;
629 break;
630 case MISCREG_TEECR:
631 case MISCREG_TEEHBR:
632 trapToHype = hstr.ttee;
633 break;
634 // No default action needed
635 default:
636 break;
637 }
638 }
639 }
640 return trapToHype;
641}
642
643bool
644mcrrMrrc15TrapToHyp(const MiscRegIndex miscReg, CPSR cpsr, SCR scr, HSTR hstr,
645 HCR hcr, uint32_t iss)
646{
647 uint32_t crm;
648 IntRegIndex rt;
649 uint32_t crn;
650 uint32_t opc1;
651 uint32_t opc2;
652 bool isRead;
653 bool trapToHype = false;
654
655 if (!inSecureState(scr, cpsr) && (cpsr.mode != MODE_HYP)) {
656 // This is technically the wrong function, but we can re-use it for
657 // the moment because we only need one field, which overlaps with the
658 // mcrmrc layout
659 mcrMrcIssExtract(iss, isRead, crm, rt, crn, opc1, opc2);
660 trapToHype = ((uint32_t) hstr) & (1 << crm);
661
662 if (!trapToHype) {
663 switch (unflattenMiscReg(miscReg)) {
664 case MISCREG_SCTLR:
665 case MISCREG_TTBR0:
666 case MISCREG_TTBR1:
667 case MISCREG_TTBCR:
668 case MISCREG_DACR:
669 case MISCREG_DFSR:
670 case MISCREG_IFSR:
671 case MISCREG_DFAR:
672 case MISCREG_IFAR:
673 case MISCREG_ADFSR:
674 case MISCREG_AIFSR:
675 case MISCREG_PRRR:
676 case MISCREG_NMRR:
677 case MISCREG_MAIR0:
678 case MISCREG_MAIR1:
679 case MISCREG_CONTEXTIDR:
680 trapToHype = hcr.tvm & !isRead;
681 break;
682 // No default action needed
683 default:
684 break;
685 }
686 }
687 }
688 return trapToHype;
689}
690
691bool
692decodeMrsMsrBankedReg(uint8_t sysM, bool r, bool &isIntReg, int &regIdx,
693 CPSR cpsr, SCR scr, NSACR nsacr, bool checkSecurity)
694{
695 OperatingMode mode = MODE_UNDEFINED;
696 bool ok = true;
697
698 // R mostly indicates if its a int register or a misc reg, we override
699 // below if the few corner cases
700 isIntReg = !r;
701 // Loosely based on ARM ARM issue C section B9.3.10
702 if (r) {
703 switch (sysM)
704 {
705 case 0xE:
706 regIdx = MISCREG_SPSR_FIQ;
707 mode = MODE_FIQ;
708 break;
709 case 0x10:
710 regIdx = MISCREG_SPSR_IRQ;
711 mode = MODE_IRQ;
712 break;
713 case 0x12:
714 regIdx = MISCREG_SPSR_SVC;
715 mode = MODE_SVC;
716 break;
717 case 0x14:
718 regIdx = MISCREG_SPSR_ABT;
719 mode = MODE_ABORT;
720 break;
721 case 0x16:
722 regIdx = MISCREG_SPSR_UND;
723 mode = MODE_UNDEFINED;
724 break;
725 case 0x1C:
726 regIdx = MISCREG_SPSR_MON;
727 mode = MODE_MON;
728 break;
729 case 0x1E:
730 regIdx = MISCREG_SPSR_HYP;
731 mode = MODE_HYP;
732 break;
733 default:
734 ok = false;
735 break;
736 }
737 } else {
738 int sysM4To3 = bits(sysM, 4, 3);
739
740 if (sysM4To3 == 0) {
741 mode = MODE_USER;
742 regIdx = intRegInMode(mode, bits(sysM, 2, 0) + 8);
743 } else if (sysM4To3 == 1) {
744 mode = MODE_FIQ;
745 regIdx = intRegInMode(mode, bits(sysM, 2, 0) + 8);
746 } else if (sysM4To3 == 3) {
747 if (bits(sysM, 1) == 0) {
748 mode = MODE_MON;
749 regIdx = intRegInMode(mode, 14 - bits(sysM, 0));
750 } else {
751 mode = MODE_HYP;
752 if (bits(sysM, 0) == 1) {
753 regIdx = intRegInMode(mode, 13); // R13 in HYP
754 } else {
755 isIntReg = false;
756 regIdx = MISCREG_ELR_HYP;
757 }
758 }
759 } else { // Other Banked registers
760 int sysM2 = bits(sysM, 2);
761 int sysM1 = bits(sysM, 1);
762
763 mode = (OperatingMode) ( ((sysM2 || sysM1) << 0) |
764 (1 << 1) |
765 ((sysM2 && !sysM1) << 2) |
766 ((sysM2 && sysM1) << 3) |
767 (1 << 4) );
768 regIdx = intRegInMode(mode, 14 - bits(sysM, 0));
769 // Don't flatten the register here. This is going to go through
770 // setIntReg() which will do the flattening
771 ok &= mode != cpsr.mode;
772 }
773 }
774
775 // Check that the requested register is accessable from the current mode
776 if (ok && checkSecurity && mode != cpsr.mode) {
777 switch (cpsr.mode)
778 {
779 case MODE_USER:
780 ok = false;
781 break;
782 case MODE_FIQ:
783 ok &= mode != MODE_HYP;
784 ok &= (mode != MODE_MON) || !scr.ns;
785 break;
786 case MODE_HYP:
787 ok &= mode != MODE_MON;
788 ok &= (mode != MODE_FIQ) || !nsacr.rfr;
789 break;
790 case MODE_IRQ:
791 case MODE_SVC:
792 case MODE_ABORT:
793 case MODE_UNDEFINED:
794 case MODE_SYSTEM:
795 ok &= mode != MODE_HYP;
796 ok &= (mode != MODE_MON) || !scr.ns;
797 ok &= (mode != MODE_FIQ) || !nsacr.rfr;
798 break;
799 // can access everything, no further checks required
800 case MODE_MON:
801 break;
802 default:
803 panic("unknown Mode 0x%x\n", cpsr.mode);
804 break;
805 }
806 }
807 return (ok);
808}
809
810bool
811SPAlignmentCheckEnabled(ThreadContext* tc)
812{
813 switch (opModeToEL(currOpMode(tc))) {
814 case EL3:
815 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL3)).sa;
816 case EL2:
817 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL2)).sa;
818 case EL1:
819 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL1)).sa;
820 case EL0:
821 return ((SCTLR) tc->readMiscReg(MISCREG_SCTLR_EL1)).sa0;
822 default:
823 panic("Invalid exception level");
824 break;
825 }
826}
827
828int
829decodePhysAddrRange64(uint8_t pa_enc)
830{
831 switch (pa_enc) {
832 case 0x0:
833 return 32;
834 case 0x1:
835 return 36;
836 case 0x2:
837 return 40;
838 case 0x3:
839 return 42;
840 case 0x4:
841 return 44;
842 case 0x5:
843 case 0x6:
844 case 0x7:
845 return 48;
846 default:
847 panic("Invalid phys. address range encoding");
848 }
849}
850
851uint8_t
852encodePhysAddrRange64(int pa_size)
853{
854 switch (pa_size) {
855 case 32:
856 return 0x0;
857 case 36:
858 return 0x1;
859 case 40:
860 return 0x2;
861 case 42:
862 return 0x3;
863 case 44:
864 return 0x4;
865 case 48:
866 return 0x5;
867 default:
868 panic("Invalid phys. address range");
869 }
870}
871
872} // namespace ArmISA